My LG TV is not being connected to Wi-Fi

Hello everyone,
I have purchased new LG TV (model LG 55LA965W-ZA) and it is working so nicely.
But, I am facing one issue with that. It is not able to recognize the Wi-Fi at my home. I have started facing this problem after I did an update of firmware. My router works fine looks like and when I try to connect to it, it is asking for username and password. When I am entering the correct password also it is not accepting it. Same time I am able to connect my smartphone to Wi-Fi.
What is the problem with my TV? Any issue with the latest firmware? Please advise. Thanks a lot in advance!
